Gbinbing-machine



. C. PUTNAM.

GRINDING MACHINE.

APPLICATION FILED SEPT. 21. 1918.

Patented Dec. 2, 1919.

I him I'l ml an snares nr Q.

ISRAEL C. PUTNAM, OF EAST HARTFORD, CONNECTICUT, ASSIGNOR OF ONE-HALF THARRY C. COLLORD, 0F SPRINGFIELD, MASSACHUSETTS.

1,323,496. Specification of Letters Patent. Patented Dec. 2, 19119.,Application filed September 27, 1913. Serial No. 255,905.

To all whom it may concern: of its axis of rotation and it thereforefol- Be it known that I, IsRAELC. PUTNAM, a lows that upon the rotationof the screw, citizen of the United States, residing at the bearingmember 6 and the parts asso- East Hartford, in the county of Hartfordciated therewith will be raised or lowered and State of Connecticut,have invented depending upon the direction in which the 60.

certain new "and "useful Improvements in screw is turned.

Grinding-Machines, of which the following Said bearing member 6 has acircular is aspecification. opening or pocket to receive an actuator asThis invention relates to grinding-ma- 10, in the form of an eccentricor cam. The

10 chines and especially to mechanism for hearing member 6 fits aroundsaid eccentric tightening a belt. There is a type of grindor cam and isprovided with ears or lu s,

ing-machlne comprising two shafts, each 11, perforated to receive thebolt 12, t e

equipped with a pulley adapted to be belted nut and head of which areadapted to draw together. In such a machine, involving this the lugs 11together so as to clamp said type of drive, the belt becomes lax and itbearing member to or upon the cam or ec- 70 is practically impossible atthe present time, centric '10. This cam or eccentric 10 has so far as Iam aware, to obtain under such a circular and eccentrically disposedopencircumstances, the tightening of the belt and ing 13, which isadapted to closely receive as a consequence, the proper drive. I prothedisk 14 through the center of which vlde a construction which is compactand extends the main shaft 15. Said shaft 15 7B which can in a simple,effective and easy freely turns in this disk 14, the shaft 15 way,tighten such a belt, in order for inas shown having fastened thereto atits outer stance, to insure proper transmission of end a pulley as 16,cooperative with a power from one of these pulleys to the other. smallercone pulley as l7. Each of the cbne In the drawing accompanying and formpulleys'is shown as having two steps, the so ing part of thespecification I show in detail larger section of the cone pulley 16, asillusa form of embodiment of the invention, trated, being connected asby a belt 18 with p which I will set forth fully in the following thesmaller step of the cone pulley'll. The description. I am not limited,however, to cone pulley 16 turns wit the shaft 15 as 0 this particulardisclosure; I may depart already described, the cone'pulley 17 beingtherefrom in several respects within the rigid with the shaft 19 so asto turn therescope of the invention defined of the claims with. Theshaft 19, as shown is supported following said description. for rotationin the bearing b0) 20, supported Figure 1 is an elevation of parts 0f 3/at the lower end of the bearlng member 6.

35 grinding-machine involving the invention. The shaft 19 has suitablyfastened to it a Fig. 2 is a cross section on the line 22- reducingmember as the grinding-wheel 21, of Fig. 1 looking in the direction ofthe of comparatively small diameter which is arrow. adapted to act uponwork as 22, clamped Like characters refer to like parts in both orotherwise suitably attached to the base 40 v1ew or bed 2. To facilitatethe turning of the The framework for sustaining the various eccentric orcam '10 it may, as shown, be furparts of the machine may be of anysuitable nlshed with a series of spanner holes 23. character. Thatshowncomprises the base In F igs. 1 and 2 the parts are shown as or bed2 and the column or standard 3. occupying their normal or working condi-45 Although the latter is disposed vertically, tions, the tool 21 beingpositioned to reduce this may not always be necessary. Said t e work. Itwill be assumed that it is de column has a suitable way as 4 to receivesired to t1ghten, the belt 18. In thls event for sliding longitudinalmovement, the .gib the following procedure will be adopted: or tongue 5of the bearing or carrier 6. Flrst of all the nut of the bolt 12 will beso This bearing member 6 may be moved longi loosened sufficiently topermit the bearing tudinally of the column ,3 in any desirable member 6to free the incloscd eccentric 10. way. When this is done a spanner willbe intro As shown, the bearing 6 has a threaded duced into two of theholes 23 of the cam extension 7, which is engaged by the screw, 10,whensaid cam will be turned, thus turna 8. This screw is immovable inthe direction mg the incloscd bearmg or (118k 14 thereno with, which inthe present case moves down- 2. In a grinding machine, the combinawardand as a'consequence imparts a corretion of a bearing furnished with anexten- 40 sponding downward movement to the bearsion, rotary screwimmovable in the direcing or carrier 6 and its shaft 15. and as a tionof its axis of rotation and in threaded result lowers as shown, thepulley l7 and engagement with said extension, a shaft consequentlytightens the belt 18, the movesupported by said bearing and providedmeiit bein' continued until the slack is elimwith a pulley, a circularturnable member in inated. t will of course be understood said bearinghaving a circular pocket disthat, during this action the work ofwhatposed eccentrically with respect thereto, a ever character it may beis not in position. circular bearing in said circular pocket, and Whenthe slack in the belt has been removed a shaft extending through saidcircular the nut of the bolt 12 is set, thus drawing bearing andprovided with a pulley to cothe bearing member 6 into clamping enoperatewith said other pulley. gagement with the cam or eccentric 10 and 3. Ina grinding machine the combinamaintaining substantially the adjustment.tion of a bearing, a shaft supported by said While I use stepped or conepulleys for hearing and provided with a pulley, a cirtransferring power,this obviously, may not cular turnable member in said bearing, havbenecessary in all cases nor is it essential ing a circular pocketdisposed eccentrically that I provide the type of bearings shown, withrespect thereto, a circular bearing in as I may utilize others ofdifferent kinds. said circular pocket, a shaft extending I have alreadycalled attention to the fact through said circular bearing and providedthat the adjustment of the bearing 6 or its with a pulley to cooperatewith said other equivalent is in a downward direction. pulley, the firstmentioned bearing being While'this is desirable it may not alwaysdivided in proximity to said turnable membe required. her and. beingequipped with perforated What I claim is: lugs, and a bolt extendingthrough the per- 1. In a grinding machine, the combinaforations of thelugs, the bolt having a nut,

with a pulley to cooperate with its head being adapted to engage one ofthe lugs and its nut the other, to clamp said first mentioned bearingupon said t'urnable member.

In testimony whereof I aflix my signature in the presence of twowitnesses.

ISRAEL 0. PUTNAM.

tion of a longitudinally adjustable bearing, a shaft supported by saidbearing and provided with a pulley, a turnable member in the bearing,the latter having means to hold the same in fixed relation to saidturnable member, said tu'rna'ble member having an eccentric pocket, asecond bearing turnable in said pocket, and a shaft extending throughthe second bearing and provided the other Witnesses J. B. ENGLISH,

pulley. JOHN P. REYNOLDS.

